diff --git a/django/contrib/admin/static/admin/js/jquery.init.js b/django/contrib/admin/static/admin/js/jquery.init.js
index 41b1051769..dd4605c368 100644
--- a/django/contrib/admin/static/admin/js/jquery.init.js
+++ b/django/contrib/admin/static/admin/js/jquery.init.js
@@ -1,4 +1,8 @@
-// Puts the included jQuery into our own namespace
+/* Puts the included jQuery into our own namespace using noConflict and passing
+ * it 'true'. This ensures that the included jQuery doesn't pollute the global
+ * namespace (i.e. this preserves pre-existing values for both window.$ and
+ * window.jQuery).
+ */
 var django = {
-    "jQuery": jQuery.noConflict()
+    "jQuery": jQuery.noConflict(true)
 };
diff --git a/docs/ref/contrib/admin/index.txt b/docs/ref/contrib/admin/index.txt
index 9c5ba2ca67..1e283151b0 100644
--- a/docs/ref/contrib/admin/index.txt
+++ b/docs/ref/contrib/admin/index.txt
@@ -1289,10 +1289,14 @@ The :doc:`staticfiles app </ref/contrib/staticfiles>` prepends
 definitions on forms <form-media-paths>`.
 
 Django admin Javascript makes use of the `jQuery`_ library. To avoid
-conflict with user scripts, Django's jQuery is namespaced as
-``django.jQuery``. If you want to use jQuery in your own admin
-JavaScript without including a second copy, you can use the
-``django.jQuery`` object on changelist and add/edit views.
+conflicts with user-supplied scripts or libraries, Django's jQuery is
+namespaced as ``django.jQuery``. If you want to use jQuery in your own admin
+JavaScript without including a second copy, you can use the ``django.jQuery``
+object on changelist and add/edit views.
+
+If you require the jQuery library to be in the global namespace, for example
+when using third-party jQuery plugins, or need a newer version of jQuery, you
+will have to include your own copy of jQuery.
 
 .. _jQuery: http://jquery.com